Amount for running masternode hasn't been set yet. It depends on how many masternodes we want which is not yet clear. The more is better for decentralization, on the other hand we need not to bloat the network with masternode related messages. Instead of setting the required amount it may be better to set the maximum number of masternodes and minimum required amount. Once the number of masternodes will reach the maximum only masternodes with maximum deposits will remain and others will be automatically delisted.
So if I understand this idea you're saying "No required amount of SPR is needed, put whatever SPR you believe should be enough to run a masternode into your masternode". So there will be just a few masternodes with like 10,000+ SPR in them and then many many with like 2 or 3 SPR in them and then when we are at what appears to be a maximum amount of masternodes you then 'draw the line' for required SPR based on however many masternodes are technically needed, and then everyone who has more than that amount in their masternode will need to remove their SPR to go down to that requirement and everyone who is short of that amount will need to increase their SPR to meet it?
Sort of like a market-created masternode requirement based on what is technically needed and what the market players are willing to pay.
If I'm anywhere near what you mean, I like it. It's not just an arbitrary, random amount (like 1,000 DRK).
JL